// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System;

[assembly: System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverageAssembly]

namespace WebData.BaseLib
{
    public class WebDataBaseLibException : System.Exception
    {
        public WebDataBaseLibException(string sExceptionMsg) : base(sExceptionMsg)
        {
        }
    }

    public class StringGen
    {

        public int seed;
        private string _fileLocation = string.Empty;

        protected static int[] cWhitespaceMap = {
                0x20, 0x9, 0xD, 0xA
            };

        protected static int[] cBaseCharMap = {
            //Base Chars::
            0x0041, 0x005A, 0x0061, 0x007A, 0x00C0, 0x00D6, 0x00D8, 0x00F6, 0x00F8, 0x00FF,
                0x0100, 0x0131, 0x0134, 0x013E, 0x0141, 0x0148, 0x014A, 0x017E, 0x0180, 0x01C3,
                0x01CD, 0x01F0, 0x01F4, 0x01F5, 0x01FA, 0x0217, 0x0250, 0x02A8, 0x02BB, 0x02C1,
                0x0386, 0x0386, 0x0388, 0x038A, 0x038C, 0x038C, 0x038E, 0x03A1, 0x03A3, 0x03CE, 0x03D0, 0x03D6,
                0x03DA, 0x03DA, 0x03DC, 0x03DC, 0x03DE, 0x03DE, 0x03E0, 0x03E0, 0x03E2, 0x03F3, 0x0401, 0x040C, 0x040E, 0x044F,
                0x0451, 0x045C, 0x045E, 0x0481, 0x0490, 0x04C4, 0x04C7, 0x04C8, 0x04CB, 0x04CC,
                0x04D0, 0x04EB, 0x04EE, 0x04F5, 0x04F8, 0x04F9, 0x0531, 0x0556, 0x0559, 0x0559,
                0x0561, 0x0586, 0x05D0, 0x05EA, 0x05F0, 0x05F2, 0x0621, 0x063A, 0x0641, 0x064A,
                0x0671, 0x06B7, 0x06BA, 0x06BE, 0x06C0, 0x06CE, 0x06D0, 0x06D3, 0x06D5, 0x06D5,
                0x06E5, 0x06E6, 0x0905, 0x0939, 0x093D, 0x093D, 0x0958, 0x0961, 0x0985, 0x098C,
                0x098F, 0x0990, 0x0993, 0x09A8, 0x09AA, 0x09B0, 0x09B2, 0x09B2, 0x09B6, 0x09B9,
                0x09DC, 0x09DD, 0x09DF, 0x09E1, 0x09F0, 0x09F1, 0x0A05, 0x0A0A, 0x0A0F, 0x0A10,
                0x0A13, 0x0A28, 0x0A2A, 0x0A30, 0x0A32, 0x0A33, 0x0A35, 0x0A36, 0x0A38, 0x0A39,
                0x0A59, 0x0A5C, 0x0A5E, 0x0A5E, 0x0A72, 0x0A74, 0x0A85, 0x0A8B, 0x0A8D, 0x0A8D, 0x0A8F, 0x0A91,
                0x0A93, 0x0AA8, 0x0AAA, 0x0AB0, 0x0AB2, 0x0AB3, 0x0AB5, 0x0AB9, 0x0ABD, 0x0ABD, 0x0AE0, 0x0AE0,
                0x0B05, 0x0B0C, 0x0B0F, 0x0B10, 0x0B13, 0x0B28, 0x0B2A, 0x0B30, 0x0B32, 0x0B33,
                0x0B36, 0x0B39, 0x0B3D, 0x0B3D, 0x0B5C, 0x0B5D, 0x0B5F, 0x0B61, 0x0B85, 0x0B8A,
                0x0B8E, 0x0B90, 0x0B92, 0x0B95, 0x0B99, 0x0B9A, 0x0B9C, 0x0B9C, 0x0B9E, 0x0B9F,
                0x0BA3, 0x0BA4, 0x0BA8, 0x0BAA, 0x0BAE, 0x0BB5, 0x0BB7, 0x0BB9, 0x0C05, 0x0C0C,
                0x0C0E, 0x0C10, 0x0C12, 0x0C28, 0x0C2A, 0x0C33, 0x0C35, 0x0C39, 0x0C60, 0x0C61,
                0x0C85, 0x0C8C, 0x0C8E, 0x0C90, 0x0C92, 0x0CA8, 0x0CAA, 0x0CB3, 0x0CB5, 0x0CB9,
                0x0CDE, 0x0CDE, 0x0CE0, 0x0CE1, 0x0D05, 0x0D0C, 0x0D0E, 0x0D10, 0x0D12, 0x0D28,
                0x0D2A, 0x0D39, 0x0D60, 0x0D61, 0x0E01, 0x0E2E, 0x0E30, 0x0E30, 0x0E32, 0x0E33,
                0x0E40, 0x0E45, 0x0E81, 0x0E82, 0x0E84, 0x0E84, 0x0E87, 0x0E88, 0x0E8A, 0x0E8A, 0x0E8D, 0x0E8D,
                0x0E94, 0x0E97, 0x0E99, 0x0E9F, 0x0EA1, 0x0EA3, 0x0EA5, 0x0EA5, 0x0EA7, 0x0EA7, 0x0EAA, 0x0EAB,
                0x0EAD, 0x0EAE, 0x0EB0, 0x0EB0, 0x0EB2, 0x0EB3, 0x0EBD, 0x0EBD, 0x0EC0, 0x0EC4, 0x0F40, 0x0F47,
                0x0F49, 0x0F69, 0x10A0, 0x10C5, 0x10D0, 0x10F6, 0x1100, 0x1100, 0x1102, 0x1103,
                0x1105, 0x1107, 0x1109, 0x1109, 0x110B, 0x110C, 0x110E, 0x1112, 0x113C, 0x113C, 0x113E, 0x113E, 0x1140, 0x1140,
                0x114C, 0x114C, 0x114E, 0x114E, 0x1150, 0x1150, 0x1154, 0x1155, 0x1159, 0x1159, 0x115F, 0x1161, 0x1163, 0x1163, 0x1165, 0x1165,
                0x1167, 0x1167, 0x1169, 0x1169, 0x116D, 0x116E, 0x1172, 0x1173, 0x1175, 0x1175, 0x119E, 0x119E, 0x11A8, 0x11A8, 0x11AB, 0x11AB,
                0x11AE, 0x11AF, 0x11B7, 0x11B8, 0x11BA, 0x11BA, 0x11BC, 0x11C2, 0x11EB, 0x11EB, 0x11F0, 0x11F0, 0x11F9, 0x11F9,
                0x1E00, 0x1E9B, 0x1EA0, 0x1EF9, 0x1F00, 0x1F15, 0x1F18, 0x1F1D, 0x1F20, 0x1F45,
                0x1F48, 0x1F4D, 0x1F50, 0x1F57, 0x1F59, 0x1F59, 0x1F5B, 0x1F5B, 0x1F5D, 0x1F5D, 0x1F5F, 0x1F7D,
                0x1F80, 0x1FB4, 0x1FB6, 0x1FBC, 0x1FBE, 0x1FBE, 0x1FC2, 0x1FC4, 0x1FC6, 0x1FCC,
                0x1FD0, 0x1FD3, 0x1FD6, 0x1FDB, 0x1FE0, 0x1FEC, 0x1FF2, 0x1FF4, 0x1FF6, 0x1FFC,
                0x2126, 0x2126, 0x212A, 0x212B, 0x212E, 0x212E, 0x2180, 0x2182, 0x3041, 0x3094, 0x30A1, 0x30FA,
                0x3105, 0x312C, 0xAC00, 0xD7A3,
            //Ideographic::
            0x4E00, 0x9FA5, 0x3007, 0x3007, 0x3021, 0x3029,
            //Combining Chars::
            0x0300, 0x0345, 0x0360, 0x0361, 0x0483, 0x0486, 0x0591, 0x05A1, 0x05A3, 0x05B9,
                0x05BB, 0x05BD, 0x05BF, 0x05BF, 0x05C1, 0x05C2, 0x05C4, 0x05C4, 0x064B, 0x0652, 0x0670, 0x0670,
                0x06D6, 0x06DC, 0x06DD, 0x06DF, 0x06E0, 0x06E4, 0x06E7, 0x06E8, 0x06EA, 0x06ED,
                0x0901, 0x0903, 0x093C, 0x093C, 0x093E, 0x094C, 0x094D, 0x094D, 0x0951, 0x0954, 0x0962, 0x0963,
                0x0981, 0x0983, 0x09BC, 0x09BC, 0x09BE, 0x09BE, 0x09BF, 0x09BF, 0x09C0, 0x09C4, 0x09C7, 0x09C8,
                0x09CB, 0x09CD, 0x09D7, 0x09D7, 0x09E2, 0x09E3, 0x0A02, 0x0A02, 0x0A3C, 0x0A3C, 0x0A3E, 0x0A3E, 0x0A3F, 0x0A3F,
                0x0A40, 0x0A42, 0x0A47, 0x0A48, 0x0A4B, 0x0A4D, 0x0A70, 0x0A71, 0x0A81, 0x0A83,
                0x0ABC, 0x0ABC, 0x0ABE, 0x0AC5, 0x0AC7, 0x0AC9, 0x0ACB, 0x0ACD, 0x0B01, 0x0B03, 0x0B3C, 0x0B3C,
                0x0B3E, 0x0B43, 0x0B47, 0x0B48, 0x0B4B, 0x0B4D, 0x0B56, 0x0B57, 0x0B82, 0x0B83,
                0x0BBE, 0x0BC2, 0x0BC6, 0x0BC8, 0x0BCA, 0x0BCD, 0x0BD7, 0x0BD7, 0x0C01, 0x0C03,
                0x0C3E, 0x0C44, 0x0C46, 0x0C48, 0x0C4A, 0x0C4D, 0x0C55, 0x0C56, 0x0C82, 0x0C83,
                0x0CBE, 0x0CC4, 0x0CC6, 0x0CC8, 0x0CCA, 0x0CCD, 0x0CD5, 0x0CD6, 0x0D02, 0x0D03,
                0x0D3E, 0x0D43, 0x0D46, 0x0D48, 0x0D4A, 0x0D4D, 0x0D57, 0x0D57, 0x0E31, 0x0E31, 0x0E34, 0x0E3A,
                0x0E47, 0x0E4E, 0x0EB1, 0x0EB1, 0x0EB4, 0x0EB9, 0x0EBB, 0x0EBC, 0x0EC8, 0x0ECD,
                0x0F18, 0x0F19, 0x0F35, 0x0F35, 0x0F37, 0x0F37, 0x0F39, 0x0F39, 0x0F3E, 0x0F3E, 0x0F3F, 0x0F3F, 0x0F71, 0x0F84,
                0x0F86, 0x0F8B, 0x0F90, 0x0F95, 0x0F97, 0x0F97, 0x0F99, 0x0FAD, 0x0FB1, 0x0FB7, 0x0FB9, 0x0FB9,
                0x20D0, 0x20DC, 0x20E1, 0x20E1, 0x302A, 0x302F, 0x3099, 0x3099, 0x309A, 0x309A,
            //Digit::
            0x0030, 0x0039, 0x0660, 0x0669, 0x06F0, 0x06F9, 0x0966, 0x096F, 0x09E6, 0x09EF,
                0x0A66, 0x0A6F, 0x0AE6, 0x0AEF, 0x0B66, 0x0B6F, 0x0BE7, 0x0BEF, 0x0C66, 0x0C6F,
                0x0CE6, 0x0CEF, 0x0D66, 0x0D6F, 0x0E50, 0x0E59, 0x0ED0, 0x0ED9, 0x0F20, 0x0F29,
            //Extender::
            0x00B7, 0x00B7, 0x02D0, 0x02D0, 0x02D1, 0x02D1, 0x0387, 0x0387, 0x0640, 0x0640, 0x0E46, 0x0E46, 0x0EC6, 0x0EC6, 0x3005, 0x3005, 0x3031, 0x3035,
                0x309D, 0x309E, 0x30FC, 0x30FE
            };

        public static string GetIllegalXmlString(int iMaxChar, bool bAbsolute)
        {
            return WebData.BaseLib.StringGen.GetIllegalXmlStringWithSeed(iMaxChar, bAbsolute, 0);
        }
        public static string GetIllegalXmlStringWithSeed(int iMaxChar, bool bAbsolute, int iSeed)
        {
            int i = 0;
            Random cRandom;

            if (iSeed != 0)
            {
                cRandom = new Random(iSeed);
            }
            else
            {
                cRandom = new Random();
            }
            string sResult = string.Empty;
            int iStrLen = bAbsolute ? iMaxChar : cRandom.Next(1, iMaxChar);

            //get the maximum number of illegal characters in the valid range.
            int iSum = 0;
            for (i = 0; i < cBaseCharMap.Length; i += 2)
            {
                //special processing for 0
                if (i == 0)
                {
                    iSum += cBaseCharMap[i] - 1;
                }
                else
                {
                    //as the data in the table is not sequential, we
                    //we need to take an educated guess if this is a non interval
                    //we will take that the rage shouldn't be more than 100 chars
                    //as well as the range shouldn't be negative
                    if ((cBaseCharMap[i] - cBaseCharMap[i - 1] - 1 > 0) &&
                        (cBaseCharMap[i] - cBaseCharMap[i - 1] - 1 < 100))
                    {
                        iSum += cBaseCharMap[i] - cBaseCharMap[i - 1] - 1;
                    }
                }
            }

            for (int iChar = 0; iChar < iStrLen; iChar++)
            {
                //get a rand number out of that
                int iRandNum = cRandom.Next(iSum);

                //get the right char under the number we just got
                i = 0;
                int iVal = 0;

                while (true)
                {
                    iVal = iRandNum;
                    //special case for 0
                    if (i == 0)
                    {
                        iRandNum -= cBaseCharMap[i] - 1;
                    }
                    else
                    {
                        if (cBaseCharMap[i] - cBaseCharMap[i - 1] - 1 > 0)
                        {
                            iRandNum -= cBaseCharMap[i] - cBaseCharMap[i - 1] - 1;
                        }
                    }

                    if (iRandNum >= 0)
                    {
                        i += 2;
                    }
                    else
                    {
                        break;
                    }
                }

                //special case for i=0
                if (i == 0)
                {
                    sResult += (char)iVal;
                }
                else
                {
                    sResult += (char)(cBaseCharMap[i - 1] + iVal);
                }
            } //for string

            return sResult;
        }

    } //StringGen
}//namespace
